Textbox Value Retaining Problem after populating from Listbox dropdownextender.

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C#

ASP.NET

Hi,

I have my code wherein I have used 2 TextBoxes , 2 Listboxes and a button.

textbox1 - First Name
textboox2- Last Name
listbox1 - Populated from Emp table in MS Access
listbox2 - Populated from Emp table in MS Access
Button1 - to fetch details of name entered and display on same page on some labels.

TextBox1 has a dropdownextender which is populated from ListBox1 and TextBox2 has a dropdownextender which is populated from ListBox2.

I did the javascript code and the selected value is now showing onto the respective textboxes as below:

//In code behind..
ListBox1.Attributes.Add("onclick", "setText1(this.options[this.selectedIndex].value);");
            ListBox2.Attributes.Add("onclick", "setText2(this.options[this.selectedIndex].value);");

//In source code
function setText1(newValue) 
{
    document.getElementById("<%=txtbx_Firstname.ClientID %>").value = newValue;
}
function setText2(newValue1) 
{
    document.getElementById("<%=txtbx_Lastname.ClientID %>").value = newValue1;
}

Problem:
When I click the Button to fetch details of entered name, the textboxes gets cleared. due to this, I am not able to make a comparison between the textbox values and database values.

Please help how to retain the textbox values and use in my code.

My full page functionality depends on this.